<!DOCTYPE html>
<html>
<head>
        <title>Dom Document Test</title>
</head>

<body>
    <div id="depth-3">
        <div id="depth-4">
            <div id="depth-5">
                <div id="depth-6"></div>
            </div>
        </div>
    </div>
    <iframe src="iframe-content.html"></iframe>
</body>
</html>